/* roulang page: index */
/* 自定义属性与全局重置 */
    :root {
      --primary: #FF5E13;
      --primary-dark: #1B1C3E;
      --bg: #F5F6FA;
      --card: #FFFFFF;
      --text: #1F2329;
      --text-secondary: #86909C;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --radius-lg: 16px;
      --radius-btn: 12px;
      --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.08);
      --border-light: #E5E8EF;
      --transition: all 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      margin: 0;
      padding: 0;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.5;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: transparent;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }
    
    .navbar.scrolled {
      background: #FFFFFF;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: #FFFFFF;
      transition: color 0.3s;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    
    .navbar.scrolled .logo {
      color: var(--primary-dark);
    }
    
    .logo i {
      color: var(--primary);
      font-size: 28px;
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 500;
      font-size: 15px;
      color: rgba(255,255,255,0.9);
      transition: color 0.3s;
    }
    
    .navbar.scrolled .nav-links {
      color: var(--text);
    }
    
    .nav-links a:hover {
      color: var(--primary);
    }
    
    .nav-cta {
      background: var(--primary);
      color: #FFFFFF !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    
    .nav-cta:hover {
      background: #E54D0A;
      transform: translateY(-1px);
    }
    
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      box-shadow: 0 -4px 20px rgba(0,0,0,0.06);
      z-index: 50;
      height: 64px;
      padding-bottom: env(safe-area-inset-bottom);
      justify-content: space-around;
      align-items: center;
    }
    
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-secondary);
      gap: 4px;
    }
    
    .mobile-nav-item i {
      font-size: 20px;
    }
    
    .mobile-nav-item.active {
      color: var(--primary);
    }
    
    @media (max-width: 768px) {
      .navbar .nav-links, .navbar .nav-cta {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .navbar {
        background: rgba(27, 28, 62, 0.9);
        backdrop-filter: blur(8px);
      }
      .navbar.scrolled {
        background: #FFFFFF;
      }
    }
    
    /* Hero 区块 */
    .hero {
      background: linear-gradient(135deg, #1B1C3E 0%, #2A2D5C 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      position: relative;
      overflow: hidden;
    }
    
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      pointer-events: none;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 60px;
    }
    
    .hero-text {
      flex: 1;
      color: #FFFFFF;
    }
    
    .hero-text h1 {
      font-size: 48px;
      line-height: 56px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    
    .hero-text p {
      font-size: 16px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
      max-width: 480px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    
    .btn-primary:hover {
      background: #E54D0A;
      transform: translateY(-2px);
    }
    
    .btn-outline {
      background: transparent;
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.5);
      cursor: pointer;
      transition: var(--transition);
    }
    
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: #FFFFFF;
    }
    
    .hero-illustration {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    
    .hero-illustration img {
      max-height: 400px;
      object-fit: contain;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.3));
    }
    
    .hero-badges {
      display: flex;
      gap: 20px;
      margin-top: 48px;
      flex-wrap: wrap;
    }
    
    .badge-item {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 16px 24px;
      color: #FFFFFF;
      text-align: center;
    }
    
    .badge-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
    }
    
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        gap: 40px;
      }
      .hero-text h1 {
        font-size: 32px;
        line-height: 40px;
      }
      .hero-badges {
        justify-content: center;
      }
      .hero-illustration img {
        max-height: 250px;
      }
    }
    
    /* 通用板块样式 */
    .section {
      padding: 100px 0;
    }
    
    .section-title {
      font-size: 36px;
      font-weight: 600;
      line-height: 44px;
      margin-bottom: 16px;
      color: var(--primary-dark);
    }
    
    .section-sub {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }
    
    .card-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .card i {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    
    .card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    
    .feature-tag {
      background: rgba(0, 181, 120, 0.1);
      color: var(--success);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-top: 12px;
    }
    
    /* 产品矩阵 2x2 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    
    .product-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    
    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .product-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    
    .product-info {
      padding: 24px;
    }
    
    /* 图文交错场景 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    
    .scene-text {
      flex: 1;
    }
    
    .scene-img {
      flex: 1;
    }
    
    .scene-img img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }
    
    /* 案例数据墙 */
    .case-track {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    
    .case-card {
      min-width: 240px;
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 600;
      cursor: pointer;
      font-size: 16px;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F5F6FA;
      border-radius: 8px;
      margin-bottom: 12px;
    }
    
    .faq-answer.open {
      max-height: 200px;
    }
    
    .faq-answer p {
      padding: 16px;
      margin: 0;
      color: var(--text-secondary);
    }
    
    /* 最终CTA */
    .cta-banner {
      background: linear-gradient(135deg, #FF5E13, #FF7F3F);
      padding: 80px 0;
      text-align: center;
      color: #FFFFFF;
    }
    
    .cta-banner h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    
    .btn-white {
      background: #FFFFFF;
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      display: inline-block;
      margin-top: 24px;
      transition: var(--transition);
    }
    
    .btn-white:hover {
      background: #F0F0F0;
      transform: scale(1.02);
    }
    
    /* 页脚 */
    .footer {
      background: var(--primary-dark);
      color: #86909C;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 12px;
    }
    
    @media (max-width: 992px) {
      .card-grid { grid-template-columns: repeat(2, 1fr); }
      .product-grid { grid-template-columns: 1fr; }
      .scene-row { flex-direction: column; }
      .scene-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    
    @media (max-width: 768px) {
      .section { padding: 80px 0; }
      .section-title { font-size: 26px; }
      .card-grid { grid-template-columns: 1fr; }
    }